Process of making lubricating oil



Patented nee. 2a, 1931- UNITED S A ES rA'raNr OFFICE some nriaox, or Los ANGELES, mm D. BIAL, or L08 anentns. 00cm, m Jon's moormnnn, or wan-rm, oar-moans, assrenoas, BY mnsrm assremrms,

"r0 monrmnn onoourm or camronnm,

' CORPORATION 01' DELAWARE or nos anentns, canrroann, a

raocnes or name nuraroazmre on.

Io Drawing.

This invention relates to a new anduseful lubricating oil and process of making same, and is a continuation inart of the pendin application of John 0. lack, Wirt D. Bia

5 and John R. McConnell, Serial Number 141,424, filed October 13, 1926, process of im arting fluorescence to oil. i

s stated inthat pending application, the trade associates a green fluorescent lubricating oil stock with quality, therefore, it is desirable for commercial reasons to impart a 7 green fluorescence to certain grades of lubricating oil stock.

It is generally knownto those skilled in the Ma, that certain lubricating oil stocks without this green fluorescence may contain a blue fluorescence, and this bluefluore scence usually is characteristic of a stock which has been derived by distillation.

In the manufature of lubricatin oil from a crude oil free from asphalt or en stantially free from asphalt, a green fluorescence result in the residuum, remaining after the removal of the lower boiling oils, even thou h .25 the residuum has been subjected to a lig t cracking operation to crystallize the amorphous wax contained therein, and a lubricating oil stock can be produced with the desired green fluorescence. Itv is also well known that a lubricating oil stock with a green fluorescence can be made'by acid treat- 7 in an asphalt base oil residuum, if suflicient acid is employed to'remove substantially all the asphaltic content. However, such, methods' are impracticable since very large amounts of acid must be; used, thus entailing low yields of the finished lubricating oils.

,It is an object of the present invention to produce a lubricating oil stock with a reen fluorescence, characterized by a red, re dish brown, yellow, or shades of yellow, when viewed'by transmitted light, and a green, or shades of green, when viewed by reflected hgivt; Y v ,e have found that certain high'boiling distillates derived from coal tar, water gas tar, or residuums" of the same, contain gre n fluorescent bodies and may be employed for imparting this'desired green fluorescence to,

lubricatingoil stock;

imam ma nit, m7. Serial no. was e The process ofthis application consists in u commingling high flash dlstillates containing .green fluorescent bodies, derived from the distillation of coal tar, water gas tar, or residuums of the same, with a lubricating oil stock, in quantities suflicient to impart to said lubricating oil stock a desired green fluorescence, which will also reduce the cold test of the lubricating oil stock as described in the Bendmg application of John C. Black, .Wirt

Rial and John RLMcConnell, Serial Number 177,834, filed 'March 23;, 1927, to which referencelis hereby made.

It is an important advanta e of this proces s that by employing a high boiling coal ,tar distlllate containing green fluorescent bodies no carbonaceous impurities are associated withthe material introduced into the oil. 1

As a specific example of a coal tar distillate containing" green fluorescent bodies, we prefer to 'empllgy that fraction known as middle oils from approximately 400 to 600? higher; The lubricating oil to which the desired green fluorescence 1s to be added is comvmg boilin points ran g I E i-3r mingled with the required amount'of this coal tar distillate containin green fluorescent bodies in quantities su cient to impart the desire intensity of lgreen .to the lubricating stock when viewed y reflected li ht. The amount of coal tar distillate (mid e oil) re qmred ranges from 1 to as high as'10%, or higher 1 depending upon the intensity of green uorescence desired.

.' In the preferred method of operating this invention the lubricating oil stock is preferably' acid treated before the addition of the coal tar distillate, after which the sludge is removed, and the acid treated oil is then commingled with the coal tar distillate, preferably that fraction known in the dist1llation of coal tar as middle oil in quantities suflicient to impart to the lubricating oil stock the required 11 fluorescence, and is then clarified and ecolorized to the required degree by a decolorizing clay at tenjiiperaturee or the j substantiall' notless than 230 acid treated lubricating oil stock substantiallyfree of acidk'sludgeis commingled with the coal tar distiilate'in thepresenceof a decolorizing clay at elevated temperatures sufficient to clarify and decolorize the lubricating oil to the required degree, after which the clarified and decolorized oil containing the desired fluorescence is separated from the clay and adsorbed coloring matter by a filtering operation.

While the process herein described is well adapted for carrying out the objects of the present invention, it is understood that various modifications may be made without departing from the invention and the invention includes all such modifications and changes as come within the scope of the appended claims.

We claim:

1. A process of simultaneously refining and imparting a green fluorescence to a lubri-- cating oil which is deficient in fluorescence, comprising, commingling a mineral lubrieating oil with a decolorizing clay and a coal tar distillate containing green fluorescent bodies, at temperatures suflicient to clarify and decolorize to the desired degree the lubricating oil and coal tar distillate, containing the said fluorescent bodies, and then separating the lubricating oil containing the coal tar distillate and green fluorescent bodies from the decolorizing clay and adsorbed constituents. c

2. A process of simultaneously refining and imparting a green fluorescence to a lubricating oil which is deficient in the same, comprising, commingling a mineral lubricating oil with a decolorizing clay and an aromatic oil distillate containing green fluorescent bodies, at a temperature substantially not less than 230 F., and then separating the lubricating oil containing the aromatic oil distill? late and green fluorescent bodies from the decolorizing clay and adsorbed constituents.

, In testimony whereof they afiix their signatures.

JOHN G. BLACK. WIRT D. RIAL- JOHN- R. MoCONNELL. 

